Duct Weight Calculator

A takeoff tool for sheet metal quantities: enter the duct size, run length, gauge and material to get weight per foot and for the whole run, plus the insulation and lagging surface area.

Duct & Material

Gauge can follow the pressure class or be set directly.

Duct shape

Run length (ft)

Width (in)

Height (in)

Material

Gauge selection

Pressure class

Seam and reinforcement allowance (%)

Takeoff Results

Sheet metal weight, whole run: 744 lb
Weight per foot: 7.44 lb/ft

Surface / insulation area: 600.0 ft²
Perimeter: 72.0 in
Gauge used: 24 ga — 0.701 mm
Allowance applied: 10%

Gauge output is indicative. Confirm against SMACNA construction tables before issuing for fabrication.

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Important Disclaimer

This calculator is for preliminary design guidance only. Final duct sizing, construction, and installation must be performed by qualified professionals and comply with applicable codes and standards.